This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 23 |
| 6 | 68 |
| 7 | 217 |
| 8 | 738 |
| 9 | 2662 |
| 10 | 10111 |
| 11 | 40281 |
| 12 | 167605 |
| 13 | 725850 |
| 14 | 3262107 |
| 15 | 15175084 |
| 16 | 72908536 |
| 17 | 361068922 |
| 18 | 1839982245 |
| 19 | 9633358049 |
| 20 | 51746379547 |
| 21 | 284824200163 |
| 22 | 1604632175859 |
| 23 | 9243292234736 |
| 24 | 54390064543757 |
| 25 | 326645626694244 |
| 26 | 2000556362576213 |
| 27 | 12485902607285611 |